Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
Volume 218, Issue 10, Pages 1175-1179Publisher
PROFESSIONAL ENGINEERING PUBLISHING LTD
DOI: 10.1243/0954406042369062
Keywords
solid state refrigeration; crystalline phase changes; metal alloys
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The well-known fact that a phase change is normally accompanied by a relatively large change in internal energy is explored and is used to develop an innovative method of achieving refrigerative effects in solid state metal alloys. Applying a cyclic mechanical stress in certain materials can induce crystalline structural changes, with accompanying absorption or release of heat. Simple experiments are reported with a particular nickel-titanium alloy where temperature drops well below 10 degreesC of ambient wen. achieved. The experimental work was undertaken at ambient temperature and temperature excursions of + 16 and - 14 degreesC of ambient temperatures were measured. These temperature excursions occurred in a material with a density of over 6000 kg/m(3). Ways in which the concept of 'solid state refrigeration' using mechanical actuation are suggested and partially examined.
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